Device for producing thermoplastic resin continuous length sections reinforced with long fibers

Abstract

In a pultrusion device for producing continuous length sections prepared from thermoplastic resins reinforced with long fibers, the vertical angle (α) of an upstream conical surface of a conical portion, which constitutes a shaping nozzle perforated through the downstream end wall of the device ranges from 15 to 35 degrees and the shaping nozzle has a land portion having a length of 1 to 5 mm in the downstream area subsequent to the upstream conical surface. According to this pultrusion device for producing continuous length sections prepared from thermoplastic resins reinforced with long fibers, the long fibers never undergo any breakage nor fluffing during the opening treatment and this accordingly leads to the substantial reduction of pill-formation. As a result, the opening-impregnation device of the present invention provided at least with the downstream end wall carrying the shaping nozzle (including the land portion) can stably and continuously be operated over a long period of time, without any trouble such as those encountered in the conventional devices.

What is claimed is:  
     
       1. A pultrusion device for manufacturing a reinforced continuous length section prepared from a thermoplastic resin reinforced with long fiber reinforcements which comprises a shaping nozzle arranged with a conical portion connected to a cylindrical land portion subsequent to the upstream conical portion, which nozzle is equipped at least with a downstream end wall which comprises a vertical angle (α) of an upstream conical surface of the upstream conical portion ranges from 15 to 35 degrees, a length of the land portion ranges from 1 to 5 mm and the length of the shaping nozzle on the central axis extending from the upstream end towards the downstream end of the nozzle ranges from 5 to 35 mm. 
     
     
       2. The vertical angle (α) of the upstream conical surface of the conical portion, as set forth in  claim 1 , ranges from 20 to 35 degrees. 
     
     
       3. The length of the shaping nozzle, as set forth in  claim 1 , ranges from 15 to 30 mm. 
     
     
       4. The length of the shaping nozzle, as set forth in  claim 2 , ranges from 15 to 30 mm.